Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d73fe6e3ebcf11…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 16:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a30300c66eb18cfb123bbdfbb28b4fb1 SHA-1: 5776c155ebfdfb62ab3589f65b5c55a75fd17d12 SHA-256: 69d73fe6e3ebcf118a43f59588ff90a2b79554edd2d6830a049a497e3cac752e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs, many hosted on what appear to be compromised CMS uploads, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://almuhja.com/ckfinder/userfiles/files/rojarewalixufiteva.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/pujibesosodavejalopivazi.pdf
    • http://naviway.su/upload/files/lurezibosuzaf.pdf
    • http://ingenermarket.ru/userfiles/20785431023.pdf
    • https://dveropolis.ru/upload_picture/38555933493.pdf
    • https://likeevent.it/writable/public/userfiles/file/fadowezujuvape.pdf
    • http://studiospazioambiente.it/userfiles/files/goruwurufero.pdf
    • http://www.rupankar.com/fckimages/file/keluze.pdf
    • http://spbi.cz/res/file/mijujusatajunumixumaguwe.pdf
    • http://fields-on-earth.com/images/blog/file/89634609110.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01e14856c---lewisugenutidetoregin.pdf
    • http://educasters.co/ckfinder/userfiles/files/xidab.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb14b4b5be---doverixoxubawenajizaguxu.pdf
    • http://rivebistro.net/ckfinder/userfiles/files/xivezagibiw.pdf
    • https://jv-cms.crazy-jessie.nl/uploads/files/64309423133.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ei7lln7eqqp0bgbblr0g5klug7/46188427444.pdf
    • https://cfaegaianascente.pt/portal/userfiles/files/nalewanejer.pdf
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/regowigoninuluzemad.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipege.pdf
    • http://ciaooo.ru/uploades/userfiles/file/kikamewuletazuziwekivixus.pdf
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/luxevagefatemevagabaleg.pdf
    • http://hyunshin.net/userfiles/file/1279653450.pdf
    • http://www.galiantsolutions.com/emailimages/file/84286319964.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cara+menyadap+iphone+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d836.bin
9a6c139e2c46cef8a38c449c3d59206c2f71a65c6d9218324afbc7a0b59462dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 16616 bytes
font_01_sfnt_off00010374.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 16792 bytes
font_02_sfnt_off00011b8b.bin
efc2e925fc41063547e9b7301cd33f1b3f1dd58d628e45bbede0dead02f32671
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 10936 bytes